Abstract: A method for forming a fluorine-containing tin oxide coating on the surface of a substrate which comprises contacting the heated surface of the substrate with a vapor of monobutyltin trichloride or a mixed vapor of monobutyltin trichloride and a doping agent composed of a fluorine-containing compound of the following formulaXCHF.sub.2wherein X represents a fluorine atom, a chlorine atom, or a hydrocarbon group consisting only of carbon and hydrogen atoms,to oxidize and decompose the vapor or the mixed vapor thermally and deposit tin oxide or fluorine-containing tin oxide respectively thereon.

Abstract: A method for making a silicon dioxide coating on a surface of a substrate such as, for example, an alkali metal-containing glass sheet by dipping the substrate in a treatment liquid obtained by adding boric acid to an aqueous silicon dioxide-saturated solution of hydrosilicofluoric acid.